package day14.java2;
/*
* 单例模式懒汉式实现
*
* */
public class SingletonTest2 {


}
class Order{
    //1.私有化类的构造器
    private Order(){

    }
    //2.声明当前类对象,没有初始化
    private static Order instance =null;

    //3.声明public、static的返回当前类对象的方法
    public static Order getInstance(){
        if(instance == null){
            instance = new Order();
        }
        return instance;
    }
}